Tubular triturating-mill.



R. R. SHAFTER.

TUBULAR TRITURATING MILL.

APPLICATION FILED MAY 1s. 190e.

Patented June 29, 1909.

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R. R. ySHAPTER. TUBULAR TRITURATING MILL.

APPLICATION FILED MAY 13, 1908.

Patented June 29, 1909.

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'UNTE RlCUBEN RULAND SHAFTER, OF NEW YORK, N. Y.

TUBULAR TRITURATING-MILL.

Specification of Letters Patent.

Patented June 29, 1909.

Application led May 13, 1908. Serial No. 432,629.

To ZZ whom it ymay concern Be it known that l, lnUnnN .llULANn Snarrnn, a citizen of the United States, and a resident of the city of New York7 borough of Manhattan, in the county and Stato of New York, have invented a new and linproved 'lubular Trituratzing-Mill, of which the following is a full, clear, and exact description.

This invention is an improvement in tubular triturating mills of the character which contain a quantity of pebbles, spheres or other like pnlverizing elements. ln machines of this nature the material to be ground is introduced into the grinding tube or drum having the, pebbles, and as the drum revolves the pebbles roll upon each other and reduce the material to powder. l have dis` covered that in these machines substantially the entire pulvcrizing action takes place at the surface by the rollingI ofthe pebbles from one side ofthe drum to the other as the latter revolves. As these pebbles are considerable in weight when the drum is Vfilled to the height to obtain the best results7 which is generally about half full, the power necessary to drive the mill is materially increased. lt is my aim to get rid of the large percent. of the dead weight of the pebbles and the disadvantages entailed by their use, and at the same time increase the grinding capacity of the mill, which l do by placing in the drum a stationary body to fill the space ordinarily occupied by the center mass of pebbles, the body preferably providing an annular space between it and the drum for the passage of the pebbles, and having a flat top face inclined to the horizontal at an angle substantially equal to the ang-le of repose of the triturating mass, with the high edge of the body located adjacent to the side of the drum moving upwardly, whereby the pebbles and the material being ground will be drawn through the annular passage by the revolution of the drum, and will roll down the inclined upper surface of the body to the opposite side of the drum and thus reduce the .material to a powder.

Reference is to be had to the accoinpany ing drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a central vertical longitudinal section through a tubular grinding mill cinbodying .my invention; Fig. 2 is an end view ofthe same', Fig. 3 is a cross section through the tube or drum; and liig. #L is a fragmentary sectional view of a drum having a modified form of lining.

ltevolubly mounted in suitable supports 5 are the hollow gudgeons formed on the opposite end heads of a tube or drum T which is preferably made in two longitudinal half sections joined together at one side by hinges S, and at the opposite side adapted to be locked in closed position through eye-bolts E) by any suitable means. 'lhe drum is made up of a metal jacket having a lining of vitrilied brick or other suitable material l0, as is the customary practice. in mills of this character. These bricks may all be laid llat, as shown in vllig. 3, or alternately stood on ends, as in Fig. 4, as desired, in the latter case the projecting portions of the brick stood on ends operating to draw the lriturating mass around with the drum as the latter revolves.

fithin the drum l provide a body l l ,which is the primary feature of my invention, said body being preferably hollow in order to insure lightness, and extends longitudinalbr of the drum almost its full length. 'lhe body in its preferred form is approximately semicircular in (-,i'oss-section and arranged eoncentric or slightly eccentric to the drum, providing an annular passage therebetween. The llat face of the body is arranged at the top at an angle approximately equal to the. angle of repose of the triturating mass, with the elevated edge of the said top located adjacent to that side of the drum moving upwardly. The top face of the body is preferably provided with a number of longitudinally arranged upwardly projecting plates 12, between which is placed a layer of brick forming the top face of the, body which is arrangedslightly below the top of the plates l2. The body at its forward end connects with a feed tube 13 having a feed hopper 1.4-, and in which a spiral conveyor 15 is revolubly mounted; and at the opposite end the body connects with a discharge, tube .1(3, which, like the feed tube 13, passes through one of the gudgeons of the drum and is stationarily iixed concentric therewith in any custonniry or approved way. ',lhe discharge tubeI also passes through a perforated plate 17, at the inside of whichit is provided with an opening 1Q for receiving the pulver-ized material.

this hole a limited access may be had to the interior of the drum for repairs and other purposes; or if it is desired to get between the body and the drum, as when placing in or renewing the lining, the two sections of the drum are unlocked and swung apart on their hinges. For revolving the drum I have shown the usual mechanism, which consists of a gear 2l, in mesh with a smaller gear 22, carried on a shaft 23, which is provided with a driving pulley 24, the gear 2l being rigidly attached to the drum near one end, this special construction, however, forming no part of my invention, as the drum as well as the spiral cenveyer, may be driven in any approved way.

In the drum is placed a suflicient quantity of triturating elements 2F to fill the annular space between tl e hollow body and the lining of the drum, and substantially cover the upper surface of the body. The conveyer and drum are set in mot ion, and the material to be `round is introduced into the hopper 14. As the drum revolves, the triturating elements, together' with the material, are carried around through the annular passage and roll down the top inclined face of the body, a layer of the pebbles being caught and held by the projecting top edges of the plates l2, and the layers of pebbles above them roll or slide over these pebbles and pulverize the material in passing to the opposite side of the drum.

It will be noted in Fig. .3 that the top face of the hollow body is not exactly a plane surface b t curves upwardly as the lover edge is approached. I construct the body in this manner for the reason that after the pebbles begin to roll and acquire sufficient velocity, it is unnecessary that the angle which the face of the body makes with the horizontal be as steep, as it is desirable that the acceleration of the pebbles be checked preparatory to their passage again through the annular' space. As the material becomes thoroughly pulverized it passes through the perforations of the plate 17 and thence out through the discharge tube 16.

T."Vhile I have described the invention with some particularity, I nevertheless regard the precise embodiment as immaterial' and consider that the invention is deiined by the scope of the annexed claims.

Iilaving thus described my invention, I

claim as new and desire to secure by Letters Patent:

l. A tubular triturating mill, comprising a revoluble drum adapted to contain a quantity of triturating elements, and a body fixed within the drum as a substitute for certain of said elements, and over and around which said elements are drawn by the revolution of the drum during the triturating operation.

2. A tubular triturating mill comprising a drum, an imperforate body fixed within the druin and arranged approximately parallel to the axis thereof, and a quantity of triturating elements within the drum, movable around said body.

3. A tubular triturating mill comprising a revoluble drum, av body fixed within the drum extending approximately its full length and having an upper face inclined laterally with respect to the axis of the drum, and a quantity of triturating elements within the drum, successively movable about and over the upper face of the body during the revolution of the drum.

Ll. A tubular triturating mill, comprising a revoluble drum adapted to contain a quantity of triturating elements, means for introducing into the drum, the material to be ground, and a body within the drum extend ing the major portion of the length thereof and around which said elements repeatedly pass when the d rum is revolved.

5. A tubular triturating mill, comprising a revoluble drum having hollow gud geons revolubly mounted and adapted to contain a quantity of triturating elements, a body within the drum, around which said elements travel when the drum is revolved, and a feed tube and a discharge tube supporting the opposite ends of the body and passing through said gudgeons.

6. A tubular triturating mill, comprising a drum adapted to contain a quantity of triturating elements, and a body ixed within the drum around which said elements are adapted to pass, said body having an inclined upper face, with the upper portion arranged at a greater inclination than the lower portion.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

REUBEN RU LAND SIIAFTER.

IVitnesses:

W'. W. HoLT, F. D. AMMEN. 

